This morning, bitcoin-qt just randomly crashed. I wasn't doing anything with it, it just decided to crash at some random point in time. (Ok, not true because I'm a p2pool user, but I mean to say I wasn't working with the UI at all.)

Since then I have not managed to get it to run again. It always segfaults at startup.

I have tried renaming blk0001.dat, blk0002.dat, blkindex.dat, and wallet.dat all to different filenames (simultaneously, and different enough that in my opinion the client should effectively think they're deleted) but it still crashes at startup.

Is there something I can check to see why it's crashing? (Sorry I don't have a source version installed, though I'm getting close to doing that just to see where it's crashing.) I have backups of my wallet, etc., so I'm OK with doing surgical procedures, I just don't really know where to start.